20.500.12556/DKUM-97585 Multi‑core fiber‑optic dual‑axis differential accelerometer with a broadly configurable operating range This paper presents a miniature, dual-axis, widely tunable fiber-optic accelerometer based on a four-core fiber, mechanically coupled to an inertial mass by the superelastic NiTi microwire. The proposed structure forms a compact spring–damper system with an adjustable eigenfrequency and acceleration sensitivity at the optical fiber tip. Four Fabry–Pérot interferometers are established within the structure, each being resolved by the designated core of the four-core fiber, enabling interferometric, differential and temperature-compensated two-dimensional inertial mass displacement sensing. Several devices with varying key dimensions were fabricated to validate the proposed design concept. The fabricated accelerometers exhibited eigenfrequencies ranging from 26.1 Hz to 11 kHz and static sensitivities from 3250 nm/g to 0.27 nm/g, with a noise floor as low as 80 µg/√Hz. Cross-axis sensitivity was found to be below 5%, while the output variation in both axes remained below 1% of the ±1 g measurement range over a temperature range of ΔT = 60°C. The proposed design is simple and straightforward, offering compactness, broadly configurable operating range, making it well suited for applications requiring small size, low mass, and electrically passive operation. dual-axis optical fiber accelerometer wide tunable range differential optical fiber accelerometer nickel-titanium alloy wire optical fiber tip accelerometer multi-core optical fiber optična vlakna pospeškomer true false true Elsevier B.V. Angleški jezik Slovenski jezik https://www.sciencedirect.com/journal/sensors-and-actuators-a-physical Članek v reviji 2026-03-23 11:07:13 2026-03-23 11:07:14 2026-04-20 08:21:34 0000-00-00 00:00:00 2026 0 0 11 tr. [article no.] 117713 Vol. 403 1 Jun. 2026 0000-00-00 Zaloznikova Objavljeno apc 2025-10-09 2026-03-09 2026-03-14 535 272366083 10.1016/j.sna.2026.117713 1873-3069 1-s2.0-S0924424726002645-main.pdf 1-s2.0-S0924424726002645-main.pdf 1 7AE00A78495A8E3C4DF2BCF60172A132 6c9290baa09e0e37657a5122014d2454660ffe45f1c3d6e9103d162b72a4b62d ac2b0458-26a0-11f1-ab09-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=204710 Fakulteta za elektrotehniko, računalništvo in informatiko 0 0 0